Transmission-gearing.



S. W. BLEVINS.

TRANSMISSION GEARING.

APPLIGATION FILED smmzs. 1910.

L l 9 1 nu, l PM d .w D Lw ou P 2 SHEETS--SHEET L Wfnesses Atto l" n eys Patented Mar. 14, 1911.

2 SHEETS-SHEET 2J Witnesses Inventor Attrneys -in a suitable babbit UNITED STATES PATENT OFFICE.

SAMUEL W. 4nLEvrNs, or c'LAnENnoN, TEXAS.

TRANSMISSION-Granma..

To all 'whom it may concern:

Be it known that I, SAMUEL BLnviNs,

a citizen of the United States, residing at Clarendon, in the county of Donley and State of Texas, -have*invented a new land useful ,Transmission-Gearing, of which the following is a specification.

This invention4 relates to transmission gearings and consists in the novel construction and arran ement of its parts hereinafter shown am? described. l

The object of the'invention is to provide improvements in speed changing power transmission gearing of the class generally known as the sliding lgear transmission and the principal object of thepresent invention is to provide means for securely holding and locking the sliding gears againstmovement to effect a change of speed until such time as the direct or frictional connection between the engine shaft and the driven shaft is interrupted. When this is done the chan of speed may be readily effected there y preventing thepossibility of str1 ping the teeth from any of the gear whees during the time that the change of speed is being made.

. In the accompanyin drawings :-Figure 1 is a side elevation of t e transmission gearing with parts broken away and parts in yshaft by a friction clutch 6. A reduced end 7 `of the crankshaft pro'ects the end of the tubular portion 8o the driving shaft with a bushing 9 interposed between them and the bearing end of the. said driving shaft projects into the opposite end ofthe tubular portion and is securely and rigidly keyed therein, said `driving shaft being thus made in two arts for convenience in manufacturin aid bearin end is supported gbearing 10 on vthe casing and it is axially bored inward from its rear end to receive arednced end ofthe driven shaft and form a bearing therefor.

Specication'of Letters Patent. i Patented-Mar. 14, 191,1. Application led September 23, 1910.

Serial No. 583,447.

A small axial bore 11 in said end extends therethrough to conduct oil inserted in the tubular ortion of the shaft through an oil hole 12 t erein to the bearing for the rigid end of the driven shaft.v f

` The clutch 6 consists of a facing disk 13 secured upon the forward end of the tubuf lar `portion 8 of the driving shaft and an opposed facing disk 14 with a series of friction disks 15 and- 16 between the disk 15 being attached to the shaft to turn therewith and slide longitudinally thereof and the disks 16 being of greater diameter and formed with notches in 4their periphery to receive the endof a yoke `17, which is rigidly secured to the crank shaft of the engineto cause said disks 16 to turn with the crank shaft. On the back of the facing disk 14 is a longitudinally extending sleeve 18 and sleeved uponthe driving shaft within this sleeve between'said disk and a collar 19 on said shaft is a heavy coiled spring 20 which vnormally exerts a force to move the facing disk 14 toward the facing disk 13 the friction disks between.

On the rear end' of the sleeve 18 is supported a ring 21 with balls interposed ,between thefsleeve and ring to turn freely and a ring yoke 22 embraces said ring and is pivotally attached thereto at each side by and clamp pivot bolts passing through the yoke and engaging seats on the ring. Between ears at the upper and lower sides of the yoke are journaled rollers 23. An adjusting pin 24 is pivotally attached at one end to the ears on the upper side of the yoke and slides within a bearing provided therefor in the casing, the opposite end of the said pin being screwthreaded to receive an adjusting nut which may `be adjusted to limit the inwardv movement of said pin, the same being free to slide outward in its bearing when the yoke is rocked lby the engagement of the cam 25 with the upper friction roller 23, said cam being secured uponthe transverse shaft-26 mounted in bearings in the`upper part of the casing' and provided with an o erating lever 27 which is preferably in t e form 'of a foot lever or treadle.

Formed upon the bearing end of' the driving shaft 5 is a dgear 34 having a long face and upon the a Ajacent forward portion 35 of the driven shaft is a mounted gear` wheel 36 to slide freely thereon, said gear wheel being formed with internal teeth 37 to .engage the gear 34 and thus when said gear is in the position as shown in Fig. 2 the driving and driven shafts are operatively connected together by said gear and gear wheel 36 to rotate at the same speed.

A counter shaft'38 is supported in bearin -in the casingand extends parallel with the driven shaft and on this counter shaft is secured a gear 39 in mesh with the gear 34 to transmit motion from the driving to the counter shaft. Secured upon the counter shaft ata distancefrom the gear 39 is a smaller gear or pinion 40 adapted to be engaged by the external teeth of the sliding gear 36 when said gear is moved along its` shaft and out of engagement with the gear 34 so that motion will then be transmitted from the driving shaft through thelarge gear Wheel 39, counter shaft, pinion 40 and large gear 36 to the driven shaft which Will thus be turned at a slow speed. A still smaller pinion 41 is secured upon the counter shaft at a short' distance to the rear of the pinion 40 andan idler 42 is mountednpon a stub shaft in the casing in mesh with said pinion to engage the sliding gear when the same is moved farther along its shaft, and thus the motion of the driven shaft will be'reversed. The distance between the gear.

34 and the pinion 40 is such that when the sliding gear is moved on its shaft its internal teeth will be disengaged from thel .Mounted in bearings in the casing and ex-A l tending across the same adjacent the lower ears provided upon the yoke 22 is a shaft 28,',upon which is secured a notched wheel or` cam 29 consisting of. a wheel or disk formed withl four deep notches 30, 31, 32

and 33 to receive the lower friction roller 23 carried by the said yoke.

Secured upon the transverse shaft 28 near one "side ofthe casing is a pinion 43 and sliding in suitable bearings in the casing.

is avrack bar 44 in engagement .with said pinion, a rod 1s secured to one end of said rack ,and extends outward through .ak bear-` ing. Mounted upon 'said rod 45 is a forked arm 46 the forked end of which is engaged with .a groove in thehub of the shifting gear 36 so that when the rack bar is moved the sliding gear will be moved at the same time. This movement of the rack bar turns the transverse shaft 28 and revolves the -notched Wheel 29 the -rolll 23 being thus 66. forced out of its notch and yoke 21 turned upon its pivotal connection with the pin .24 against the'actionF of the, spring 20 rev leasing the clutch. The clutch is thus released to disconnect the` driving shaft from the crank shaft upon the first movement of the tripping rod 35 and before the sliding gear is being shifted into or out of engagement with the other gears, and thus the liability of strippin the teeth from the gears vby bringing t em into mesh while being driven is obviated. When the shifting gear is inl the position shown in Fig. 2 the roll 23 is in the notch 30 but when the shifting rod is moved the notched wheel will be turned and the said roll willengage the notch 31 at which time the shifting gear .will be out of engagement with the gear 34 and pinion 40 in which position `the rod will be held by the action of the spring 20 against accidental shifting. Further movement of the shifting rod slides the gear into engagement with the pinion 40 and turns the wheel to engage its notch 32 with a roll and a still further shifting of the rod engages the gear with the idler and turns the wheel to engage the notch 33 with the roll. If when the sliding gear is shifted its teeth should obstruct those ofthe gear with which they should mesh and should said `gear be standing still, owing to the fact that the clutch has been thrown out by the shifting a further movement of the shifting rod to turn the notched'wheel far Aenough to permit the `exerts ay force to normally hold the sleeves apart but when the arm is prevented from moving in either directionby the failure of the gears to mesh or from some other cause the rod may be lnoved longitudinally through the eyes a limited distance against the action of the coiled spring.v When the gears abutand the rod is moved, as described, to operate the clutch, as soon as the gears are turned into alinement they are ,instantly drawn into mesh by the action of the said sprin 49 and the wear on the gears and the liabihty of breakage is greatly reduced by this yielding connection. By moving the lever 27 to throw the cam 25, the

yoke is swung upon the roller 23 engaged in the notched Wheel as a fulcrum and the clutch is releasedindependently of the transmission gear and without thenecessity of operating the 'shifting rod."`

Theend of he-'shaft 50 journaled in l the casing 2 in alinement with the driven shaft 4 and a clutch device 6 is adapted to operatively connect the driven shaft 4 `with the'said shaft 50. It is to be understood that the shaft 50 is operatively connected by anyqsnitahle means to the running gear of a vehicle or other machine to which the transrest the shifting bar 45 and its attachments mission gearing is applied.v Inasmuch as the parts of the clutch device 6 are exactly the same as those of the clutch device which has heretofore been described it is deemed 'unnecessary to describe in detail the structural arrangement of the clutch device 6. A lever 27 similar to the lever 27 hereinbefore described is fulcrumed at the'rear end of the casing 2 and is provided with a cam 25 similar to the cam 25 hereinbefore described and which operates against a yoke 22 in a manner similar to that in which the yoke 22 is operated upon. A rod 51 o eratively connects -the-pper'portions o the levers 27 and 27 together and is provided at a point intermediate its ends with a finger 52. A shaft 53 is journaled upon the casing 2 and is provided with a fixed segment 54 which in turn is provided at its' edge with indentations 55. The end of the finger 52 is ada ted to enter'the indentations 55 and the so id portions of the segment 54 between the said lndentations form teeth which are adapted to coperate with said finger in forming a locking mechanism for holding the shaft 53 and its attachments against movement while the members of the clutch devices 6 and 6 are in engagement with each other. The lever 27 ma be provided with a foot treadle (of any dyesired pat-tern, not shown). A lever 56 is fixed to the shaft 53 and is provided with a lower end portion which passes through the shifting rod 45 hereinbefore described. The lever V56 also carries a spring actuated pawl 57 which is adapted to engage notches 58 in a segment 59 whereby the lever 56 is secured in adjusted position.

From the above it will be seen that when the operator places'his foot upon the upper end of the lever 27 and swings the same so that the bar- 51 is moved longitudinally the cams 25 and 25 are partially rotated which in turn operates the yokes 22 and 22 which separates the members of the clutches 6 and 6 from each other. Thus the intermediate shaft 4 is disconnected from the crank shaft 11 and the shaft 50 is disconnected from the shaft 4. However prior to. the time that the lever 27 is moved in a forward direction as above indicated and the bar 5l is moved longitudinally the end of the finger 52 remains in engagement with one of the indentations 55 in the edge of the segment 54 and holds the lever 56 against movement.` After the rod 51 has been moved in the manner as above indicated and the clutch members of the clutch devices 6 and 6 have been disengaged the lever 56 is free to be moved and lnasmuch as the intermediate shaft 4 and the counter shaft 38 are then at a state of may be readily moved in order to bring the gear wheel 46 into mesh with any one of the gearsmounted upon the counter shaft 38. Thus it will be seen that at the time that the shiftable gear is moved along the intermediate shaft 4 the gears upon the counter shaft are at rest and the said gear wheels may be readil intermeshed without liability of stripping t e gears from the wheels upon either shaft. Also the cams 25 and 25 are so positioned upon their supporting shafts that as the cams 25 and 25 are turned the yoke 22 is the first to disconnect the members of the clutch device 6. Immediately after this happens however the cam 25 operates upon the yoke 22 and the members of the clutch device' 6 are operatively disconnected. Therefore it follows that the connection between the engine shaft 1 and the shaft 4 is first interrupted and the connection between the shaft 4 and the shaft 50 vis immediately thereafter interrupted. This prevents any liability of damage due to the driving and driven shafts not being disconnected from each other at pro er intervals. When the parts p engage eac other operatively the members of the clutch device 6 first operatively engage and the members of the clutch device 6 immediately thereafter engage each other. A

Having described the invention what I claim as new and desire to secure by Letters Patent is A transmission gearing comprising intermediate and terminal shafts, and clutch devices coperatively connecting said shafts, a cam shaft for operating each clutch device, a bar operatively connecting the cam shafts, together for simultaneous rotative movement, the cams being so relatively arranged upon the shafts as to operate the clutch devices successively, a counter-shaft. gear wheels of different diameters located thereon, a gear wheel slidably mounted upon said intermediate shaft and adapted to be moved successively into engagement with the gear wheels upon the counter shaft, a lever mechanism for shiftin the slidably mounted gear wheel, and a ockin fin er carried by thecam shaft connecting ar or holding the lever mechanism against movement until the cams carried by the cam shafts have o eratively disconnected the members of both c utch devices.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

SAMUEL W. BLEVIN S. 

